// throw new IOException("Multithreaded decoder is not implemented");
} else {
this._mixerCoderSTSpec.AddCoder(decoder, false);
}
} else {
ICompressCoder2 decoder = getComplexCoder(altCoderInfo);
this._decoders.add(decoder);
if (this._multiThread) {
// _mixerCoderMTSpec.AddCoder2(decoder);
// has already ben checked above